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I ask, as I was recently reminded of a sign I saw in an Office Depot in Mexico advertising "mouses".

Can this be correct in Spanish, or is it proper form to use the English plural "mice" in this case? If "mouses" is proper in this case, are there other examples where the plural form is also borrowed from an original language, but the Spanish plural would be considered incorrect?

NOTE: I know we're guilty of the same class of error in English, when we talk about a single tamale.

This is an anglicism. I cannot speak of all Spanish speaking countries but in Mexico it is very common that people use the English word for some computer terms, in this case "mouse" and instead of using the Spanish word "ratón".

The problem is that a lot of people think that that is the actual name of the device and they pluralize it as if it were a Spanish word which, of course, is not correct, but it has now become the common way of calling it.